Peters



(No Model.)

2 Sheets-Sheet l.

C. K. GILES & R. E. FENNER.

APPARATUS FOR DBMAGNETIZING WATCHES.

Patented July 20, 1886.

NA PETERS. Piwwhlbognphar. Walhlninn. DA C.

(N-o ModeL) 2 Sheets-Sheet 2.

G. K. GILES 8v R. E. FBNNBR. APPARATUS FOR DEMAGNBTIZING WATCHES.

No. 345,838. Patented July 20, 1886.

` N. )"ETERS. MMI, Wnhinlwn. D. C

UNTTED STATES PATENT OFFICE..

CHARLES K. GLES AND RICHARD E. FENNER, CF CHICAGO, lLLlNClS, SAID FENNER ASSIGNOR TC SAlD GILES.

APPARATUS FOR DEMAGNETIZING WTGt-if lGATlLGN forming part of Letters Patent No. 345,838, dated July 2G, i886.

Application tiled August ll, 1S84, Serial No. 140,571.

(No model.)

To all whom t 11i/ty concern:

13e it known that we, GuARLEs K. GrLEs and Rrcfnlnn E. FENNER, citizens of the United States, and residing at Chicago, in the county of Cook and State ol" illinois, have inventedV certain new and useful Improvements in Apparatus ier Demagnetizing lVatches, \Vatchlllakers Tools, and other Articles, which are fully set i'orth in the following specification, reference being had to the accompanying drawings, in which-- Figure l represents an elevation of an apparatus embodying our improvements; Fig. 2, a plan view of the same; Fig. 3, a detail crossscetion taken on the line .e fr, Fig. l, Fig. 4, a similar section taken on the line y y, Fig. l; Fig. 5, a detail plan section taken on the line c c, Fig. 4, and Fig. G, a detail elevation of the rheostat detached.

Cnr invention relates to an apparatus for demagnetizing the several parts ol" a watch without remevingthem from their place, and also other articles of steel or iron which may have become magnetized.

ln our invention we employ a stationary electro-magnet with mechanism for giving the necessary revolution or revolutions in i'ront thercol` oi' the articles to be operated upon, and combine therewith a rheotrope and a rheostat, by the l'ormer of which the polarity et' the electromagnet is inverted with regularity, while by the latter the force of the current passing through said magnet .is regulated so that it may be increased or diminished, as may be desired.

lt is well known that metallic articles which have become magnetized may be demagnetized by placing them within a magnetic iield in which the polarity is inverted at short and regular intervals, while the magnetic force is gradually diminished. lt is the object ol" our improvements to accomplish this without the necessity et' moving the diilerent parts, or, in other words, changing the distance between the articles and the magnets.

VWe will proceed to describe iu detail one wayin which` we have carried out ourinvention in practical form,l and will then point out definitely in the claims the special improveu ments which we believe to be new, and wish 5o to protect by Letters Patent.

ln the drawings, A represents a suitable bench or table, on which the main parts of the apparatus may be mounted, and in this instance A' is a back board set upright at the 55 back of the bench, on which some ot' the parts are mounted. This arrangementis, however, a matter oi" convenience merely, and the parts may all be mounted on a horizontal bench or table. A bed-piece, B, is secured in a fixed 6o position to the bench by means ola standard, b, and ou one end of this bed-piece is arranged an electro-magnet, C, which may be of any known construction, and need not be further described. This magnet is secured rigidly to 65 the bed, and is not intended to be moved. In front ofthe magnet is a horizontal shaft, D, which is mounted in suitable bearings in a yoke-standard, E, fastened to the other end of the bed. The inner end oi this shalt is pro- 7o vided with a fork, d, in which is mounted by suitable journals a yoke, F, the axis of which is at right angles to the axis ot' the shaft. \Vithin this yoke is rigidly fastened a ring, f, the inner face of which is coneaved slightly, 75 to adapt it to receive the face of a watch, and this fork and ring constitute the holder within which the watch is placed for operation. The back ofthe yoke is provided with a clamping -screw, f, which is set up against the 8o watch when placed in the holder, to securely fasten it in position. It will be seen that by rotating the shaft the fork at the end thereof will be revolved in front of the electro-mag net, and that the bearings of the holder will 85 also be carried around in a vertical plane in front of the magnet. Rotary motion is given to the shaft in any suitable way. In the drawings we have shown a pulley, d, over which a band, di, passes, which runs around another 9o pulley at or near the licor, worked by a treadle or some other device. These last-named parts we have not shown, as they are wcllknown means for driving pulleys, and constitute no part of our improvements, in the operation of 95 which we contemplate using any suitable den vices for imparting the required motion to thel shaft.

The rotation of the shaft and holder, as described, will obviously rotate a watch in a perpendicular plane in front of the magnet; but it is also required to give the watch an independent rotary movement about its own axis, which is effected by rotating the holder on its journals, and this we accomplish in the following way: A ring, G, is fastened rigidly to the bed in an upright position, being arranged so that the fork of the shaft revolves within it and stands at one side of the plane of revolution of the yoke-bearings. On one or both of thejournalbearings of the yoke F is a small friction-wheel, H, arranged to run in contact with the adjacent edge of the stationary ring G,- Obviously, this device will rotate the watch-holder on its own axis when the carrying-shaft is rotated, for the frictionwheel will be carried aroundrbodily, but remain in contact with the stationary ring, and so the watch within the holder will have 'a second motion imparted to it about the axis at right angles to the axis of the rotation first described.

It will be seen from this description that when the electro-magnet is properly connected up with a battery or other mechanism for producingan electrical currentthe rotation of the watch described above will be within a magnetic field, and of course the watch will be brought within the influence of the magnet. As already stated, in order to produce the desired effect, it is required to invert the electrical current in quick succession. We effect this result by placing within the circuit, between the battery and the magnet, a rheotrope, I, which, as shown in the drawings, is mounted on the back board, but may be mounted on the bench or table orin any other convenient place.

No particular construction of rheotrope is required, for one of any well-known type may be employed, the usual appliances for operating it being provided.

We have shown in thedrawings a rheotrope of ordinary construction, sometimes called a cylinder-rheotrope. The construction and operation of this device are well known, and do not require specific description here. We

need only say that z' is the usual cylinder, mounted on suitable bearings, and that to one of its journals is fastened a pulley, J, over.v which a band, j, runs from a pulley on the shaft D, so that the required motion is im- I parted to the cylinder from the same shaft; which rotates the watch. The parts are soi constructed and arranged relatively that each revolution of the shaft D will give one revolution to the cylinder of the rheotrope.

changed with greater or less rapidity. rlhe remaining' requisite to produce the desired effect is to gradually diminish the force of the current within the magnetic field within which the watch is located. This we effect by means of a rheostat, K, which is located somewhere in the circuit between the rheotrope and the magnet. It will be understood at once that a rheostat will be required of such construction that the resistance may be varied. We therefore preferably employ a rheostat of a wellknown type, generally known as thc y "sunowerrheostat, and we have shown it in the drawings located at one end of the bench, though it may be arranged at any other convenient point, provided it is placed properly within the circuit. The construction and operation of the sunfiower-rheostat is so well known that a description in detail is not necessary here. Its application in this relation will be readily understood from what we have stated above, and we have only to add that the disk k and regulator k', turned by the button k', are located on the surface of the bench, as shown in the drawings, within easy reach of the operator, while thev resistance-coils are below. Further details of description we omit, though in the drawings the construction of this rheostat, as well as of the rheotrope mentioned, is fully illustrated.

We have shown a suniiower-rheostat and prefer it in practical use, because of its convenience, but it will be understood that a rheostat of variable resistance of any suitable construction may be applied instead of the sunflower. It will be seen that with a variable rheostat placed in the circuit, as described, we are enabled to regulate the force of the current passing to the magnet, so that it may be decreased from full battery-power to zero, or substantially that. This, ofcourse, is effected by moving the regulator from one leaf to another, thereby bringing into circuit additional coils, and so increasing the resistance in a wellknown way.

Y In the operation of the apparatus it will be desired at times to send the full battery force to the magnet, and in order to accomplish this we provide a switch, L, by means of which the current is sent either directly to the magnet or around through the rheostat thereto. As shown in the drawings, the pivoted switch-lever l is connected to one of the wires leading from the -rheotrope, that one being selected ywhich conducts 'the current around through the rheostat. From the switching-point two wires lead to the magnet, one, M, directly to the connections with the magnet, so as to make a direct circuit thereto, and the other, M', y'to the rheostat, from which, in turn, another wire leads to the connections of the magnet, thus providing for another circuit to the magnet around through the rheostat,

The wire M terminates in an vanvil or button, Z', and the wire M', in a similar piece, Z2, both being arranged within the radius of IOO IIO

the button on the switch-lever whenever the latter is turned, so that in a well-known way the circuit maybe formed either directly to the magnet through the wire M or to the rheostat through the wire M. Ot course, in the former ease the full battery-power is sent to the electro-magnet, while in tlielattercase the power is regulated by the rheostat.

In using our apparatus practieallythe operation is as follows: The watch is mounted and secured in the holder as described, the switch is turned so as at first to send the full batteryeurrent to the magnet, andof course the watch will be niider the influence of the full power ot' the electroanagnet. The shaft D is now set in motion, thereby giving the watch the double rotation already described, and also operating the rlieotrope, when,ot` course, the wellknown el'tect will be produced, occasioned by the change el' polarity in the magnetic field. The switch-lever is changed tothe wire h so as to send the current through the rhcostat, the latter being at first set so as to oll'er its least resistance. rlhe revolution of the shalt is kept up and the rlieostat is set successively from one point to another, so as to gradually increase the resistance, thereby weakening the current sent to the magnet, until finally it is substantially zero. The necessary result of this operation will be a constantsuecessivc inversion of the current, while at the saine time the latter is gradually weakened, and so the ellect upon the watch. must be, as already described, gradually removing the magnetic power troni any ot' its parts,until finally it is entirely VAtreed therefrom. It will be niiderstood, et" course, that in order to secure this operation the rhcostat must be constructed so as to have at least sut'ticieiit resistance to snbstantially neutralize the lull torce ot' the battery.

rlhe apparatus which we have described above and shown in the drawings is practically operative for the purpose stated; but we do not wish to be understood as limiting onrselves to all. details ot construction and arrangement as described and shown, for they may be changed in many respects without departing from the main idea of our invention, which consists in the employment of a stationary magnet in connection with a rheotrope for inverting the current, and also this magnet in connection with a rheostat l'or regulating the l'orce of the current, and we wish to be understood as claiming, broadly, the combination of the magnet with either one et the devices, or both together.

n the detailed description of the apparatus given above we have only referred to watches7 and Vt'or operation upon them it is necessary to have the devices for revolving the watch in the manner described; but, as stated at the outset, our invention is not intended to be limited to its application to demagnetizing watches, for other articles may also be acted upon by this apparatus. lith ordinaryarti,4A

cles, however, it will not be necessary to revolve them, but they may be Vfixed in a statioir ary rest in l`ront of the magnet, or, in cases of simple tools and instruments, maybe held by the operatorin front ol` the magnet and gradually withdrawn trom thctield; but iii this latter ease the rheostat is not necessary, and may be cut out from the circuit.

XVe have not described the complete mode of connecting up the diit'ereut parts between the battery and magnet to make the circuit; but these connections are .fully shown in the drawings, from which they will be rcadilyunderstood.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, isw

l. In a demagnetiziiig apparatus, a holder for the article to be demagnetized, in combination with mechanism for turning the same, an eleetroinagnet with its poles presented to said holder, a pole-changer in the circuit of said electro-magnet, and means for varying the resistance ofthe circuit.

2. In a demagnetiaing apparatus, a holder i'or the article to be demagnetized, in combination with mechanism for tnrniiig the same, an eleetromagnet with its poles presented to said holder, a rlieotrope in the circuit of said electromagnet, a rheostat of variable resistance, and a switch whereby the rlieostat may be thrown into or ont el' the circuit ot' the elec tro-magnet.

3. vIn a deinaguetizing apparatus, a holder mounted in a iixed relation to the magnet, in con'ibination with mechanism for rotating said holder on two axes at about right angles to each other, a stationary electro magnet, a rheotrope, and a i'heostat et' variable resist ance,substantially as and for the purposes set forth.

l. lfn a deinagnetii/.ing apparatus, the revolving shalt l), in combination with the hold er mounted thereon. the stationary ring G, the i'rietionwheel ll on one or both ot' the holder journals, the electi'omagnet C, t-lie rheotrope l, and the rhecstat l, substantially as and for the purposes set i'orth.

5. ,ln a demagnetizing apparatus, the holderlshatt D, in combination with the cylinder/zi ofthe rheotrope, and the handy', ruiming over pulleys on the shalt l) and journal ofthe cyliiider, whereby the rlieotrope isoperatcd by the same shalt that revolves the holder, snbstantially as described. i

C. ln a deinagnctizing apparatus, a station ary electro-magnet, in combination with a rlieostat, a switch, L, and the two circuit-wires lll and lil', whereby the battery-current may be sent tothe magnet either directly er around through the rheostat, substantially as and for the purposes set iorth.

7. ln a deinagnet-izing apparatus, a station ary electro magnet, in combination with a rhcotrope, a rheostat et variable resistance, a switch between the rheotrope and rheostat,

IFC

IKO

and two circuit-Wires from the switch, one l rheostat, and two circuit wires. from the lo leading directly to the magnet and the other to switch, one leading directly to the magnet and the rheostat, substantially as land forthe purthe other to the rheostat, substantiailyas and poses set forth. for the purposes set forth.

8. in a demagnetizing apparatus, a revoiv- CHARLES K. GILES. ing holder mounted in a fixed relation to the RICHARD F. FENNER. magnet, in combination with astationary elee- I Witnesses:

tro-magnet, a rheotrope, arheostat of variable W. C. CORLIES,

resistance, a switch between the rheot-rope and l J. M. TEACHER. 

